Wdm
abbr. 波分多路復(fù)用（Wavelength Division Multiplex）
??? 情景例句
Thank you for a most enjoyable evening.
謝謝你舉辦這樣一個極其快樂的晚會。
I feel much better now.
我感覺好多了。
and then there are three thousand million other Milky Ways, or galaxies, in the universe.
況且在宇宙中還有30億個天河，即銀河系。